Which of the following is a technique used to inject malicious code into a web application's database? XSS CSRF SQL injection None of the above

The technique used to inject malicious code into a web application's database is SQL injection.

Here's a step-by-step explanation:

1. SQL Injection: This is a code injection technique that attackers use to insert malicious SQL statements into an entry field for execution. This can lead to unauthorized viewing of data, data manipulation, and even data deletion.

2. XSS (Cross-Site Scripting): This is a type of security vulnerability typically found in web applications. XSS enables attackers to inject client-side scripts into web pages viewed by other users. It's not used to inject malicious code into a database.

3. CSRF (Cross-Site Request Forgery): This is an attack that tricks the victim into submitting a malicious request. It uses the identity and privileges of the victim to perform an undesired function on their behalf. It's not used to inject malicious code into a database.